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(No Model.) 2 Sheets sheet; 1. D. CROWLEY. DERRICK.

No. 469,497. Patented Feb 23, 1892.

WITNESSES (No Model.) 2 SheetsSheet 2.

D. CROWLEY. DERRICK.

No. 469,497. Patented Feb.23, 1892.

I z: 2 Q LNVENTOR fitter/10116.

UNITED, STATES PATENT OFFICE.

DAVID CROWLEY, OF W'ASI-IINGTON, DISTRICT OF COLUMBIA, ASSIGN OR OF ONF-IIALF TO CHARLES K. NICHOLS, OF SAME PLACE.

ICK.

SPECIFICATION forming part of Letters Patent No. 469,497, dated February 23, 1892.

Application filed September 12,1891- gerial No. 405,487. (No model.)

To all whom, it may concern:

Be it known that I, DAVID CROWLEY, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain new and useful Improvements in Derricks, of which the following is a specification.

My invention relates to derricks, and more particularly to a derrick which is adapted to be readily movable from place to place and which can be suitably supported and arranged to readily locate or deposit material on all sides of the derrick, and while my improved derrick is adapted to many and various purposes it is especially adapted for building high structures, such as chimneys, monuments, and the like.

WVith these ends in view my invention consists in a derrick embodying substantially the features of construction and arrangement more particularly pointed out hereinafter.

In the accompanying drawings, Figure 1 is a side view showing the preferred embodiment of my invention. Fig. 2 is a plan view of the same. Fig. 3 is a sectional plan view. Fig. 4. is an. enlarged perspective view showing one arrangement of the top of the mast and its attachments. Fig. 5 is a similar enlarged view showing one means of connecting the yard to the mast. Fig. 6 is a detail.

In carrying out my invention I provide a suitable support or mast A, and this is preferably secured to foundation sills or plates B, which may be in the form of a plate, block, or cross-arms, or any other suitable support ing or anchoring materials, and preferably provided with braces B. This base may be loaded with stones or otherwise secured in a manner well-known to those skilled in the art, and in many instances I find such a support is sufficient. lVhen, however, the derrick is to be used in raising and placing heavy materials, I prefer to attach to its upper end a guide-plate C, which is swiveled or pivotally attached to a suitable bearing A in the end of the mast and leading from the guide-plate of the guys C, which are suitably secured in the usual manner to the proper attaching de vices.

Suitably connected to the mast is the yard D, and this is pivotally connected so that it can swing in a vertical plane on the axis of the pivot, and also connected to the mast so that it can swing around the mast in a horizontal plane. While these connections may be made in various ways, I have shown a sleeve D embracing the mast A and arranged to slide freely vertically up and down the mast as well as to rotate around the mast. Connected to this sleeve is a split ring D the free ends of which are held together by a suitable bolt (Z, and between the bent free ends of the ring is secured on the bolt (1 a swivelpin d, the bolt passing through the eye of the swivel-pin. This swivel is loosely conneoted to the split band or ring D which is made to embrace the yard D, the securingbolt d serving to clamp the ring around the yard as Well as to receive the eye of the halyard by means of which the yard is raised in a manner hereinafter described.

WVhile I have thus described split rings formed in two parts hinged together and secured by bolts, so that the parts can be readily adjusted, it is evident that in place of these parts I could use solid rings fitted upon the mast and yard; but I find the split rings superior, in that they allow the yard to be securely clamped between the parts of the ring, or they may be fitted loosely thereon to allow the yard to slide freely through the ring.

Mounted upon the top of the mast and upon the pivotal bearing A is the hoisting and sup porting plate or swivel E, having a number of depending arms a, to which arms the various tackle-blocks are connected.

Secured to the lower portion of the mast is a swivel-block or traveler F, having arms or eyes f extending laterally and upwardly therefrom, to which the various ropes and tackle can be connected in a manner hereinafter de scribed. .This swivel is secured in position on the mast so that it can move vertically, but is free to rotate, it fitting in a recessed portion of the mast, or it may be provided with 5 a ring F, which is permanently secured to the mast and furnishes a bearing for the swivel-plate F.

Connected to the sliding sleeve D, to which the yard D is attached, are the halyards G,

passing over a block G, with thefree ends secured to oneof the links or eyes f of the swivel-block F. By this means the yard can be elevated to any desired position on the mast and secured in this position. 7 Connected to each end of the yard by suitable metal bands h, applied thereto inthe usual way, are the top-mast lifts H, passing over the blocks H, secured to the opposite eyes or arms of the supporting-plate E, the ends of the lifts being secured to the eyes or arms f of'the traveler F. By this means the yard can be adjusted in any desired position instead of being supported by the top-mast lifts in the manner described, while the free ends are connected to the traveler.

Connected to one of the arms of the yard is a'hoisting tackle and blocks I, the tackle preferably passing over a guide-pulley i at or near the end of the yard and thence through the hoisting-tackle and runner-block 1, se-

' cured to one of the arms of the hoisting and thence passes up and through the hoisting-- tackle and runner-block I anddown within reach of the Workman, and by this means the hoisting tackle maybe directed so as to deposit the material in the desired position.

Connected to the other end of the yard D isa "counteracting tackle L, one block of Which is secured to'the ring it on the end of the yard, whilethe other-block and tackle are secured to one of the arms or eyes f of the traveler F. By means of this counteracting tackle the yard can be brought so that the weight of the material being hoisted by the hoisting-tackle is distributed throughout the mast and yard, the counteracting tackle and the'top-mast lifts and halyard, together with the mast and yard, forming a practically rigid structure to support the hoisting-tackle. Itwill beseen that by my arrangement the traveler, the yard, and the supporting-block are all pivotally mounted on the mast, and the lifts and tackle and halyards are all connected and secured to the traveler, so that'when the material is hoisted by the hoisting-tackle the yard and its connections are free to rotate around the mast'to deposit the material at any point within the radius of the arm,'the runner being used when desired to deposit the materialin radial lines-of the mast. Instead of using the runner, however, whenthe material is supported by the hoisting-tackle by'means of the top-mast lifts and counteracting tackle, one lift can be eased off While the other'isdrawn in, and the' counteracting inast lifts and counteracting tackle and is generally-not so satisfactory and convenient an arrangement as the first-mentioned.

While I have illustrated for the purposes of clearness the blocks provided with single whips, it is evident that I may use two or three orany number of whips in the block, depending upon the nature of the material to be raised, the principles of my invention being precisely the same regardless of the number of whips.

The yard D is provided with a hand-rope R, connected to one end, which may be used in swinging and guiding the yard to the desired position. The yard may be used as an ordinary boom by inserting into its end an eyeholt S, by means of which it can be connected to the traveler F, and it isthen preferred touse a traveler made in foul-sections, the ends of which sections are bent outwardly and sccured by bolts, as shown in Fig. 6.

From theabove construction it will belseen that I provide a derrick which is simple in arrangement and yet strong and effective in operation and inwhichthe weight of the material'is' evenly distributed r and by'means of which the material can be located at any'desired point within the radius of the yard, as 'the yard and its attachedatacklezall rotate together freely around the mast.

In so'meinstances in light work I find it is not necessaryto support the yard by "thexhalsliding on 'the mast, a yard connected to the sleeve, a pivoted supporting-plate mounted on the mast, and a travelerv also mounted onthe mast, and lifting and "staying tackle for the .yard connected to the plate and traveler, 'wherebythe mast may be adjusted androtatedto any desired position, substantially as described.

2."A derrick consisting of a mast'having a pivotal supporting-plate at its top, asleeve sliding on the mast, a yard'pivotally connected to the sleeve, atrave'ler mountedon the mast,

and top-mastlifts connecting'the ends of the yard to the plate and'secured to the traveler,

substantially as described.

3. In a derrick, the combination, with the mast, the sleeve sliding thereon, and the'yard pivotally connected to the sleeve, of the pivotal supporting-plate mounted on the mast, atraveler'secured to the mast-,fthe top-mast lifts connectedto the ends of the yard, and the counteracting-tackle connecting one end of theyardwith the traveler, whereby the mast may be supported in position and the lifts to the sleeve, of a pivotal supporting-plate mounted on the mast and having radiating arms, and a traveler mounted on the mast, also having arms, the yard-block, the top-mast-lift blocks, and the hoisting-block being connected to the supporting-plate, and the halyards, top-mast lifts, and counteracting tackle being connected to the traveler, substantially as described.

5, In a derrick, the combination, with the mast, a sleeve thereon, and the yard pivotally connected to the sleeve, of the supportingplate on top of the mast and the traveler secured tothe mast, hoisting-tackle and runner-block secured to one of the arms of the supporting-plate, the top-mast-lift blocks to other arms, and the halyard-block to the other arm, and a counteracting tackle secured to the traveler, the halyard and top-mast lifts being also connected to the traveler, the Whole be ing arranged so that when the material is sup- 2o ported by the hoisting-tackle the yard and its connections may be freely rotated around the mast, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of z 5 

